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memory.h
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/* * arch/arm/include/asm/memory.h * * Copyright (C) 2000-2002 Russell King * modification for nommu, Hyok S. Choi, 2004 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Note: this file should not be included by non-asm/.h files */ #ifndef __ASM_ARM_MEMORY_H #define __ASM_ARM_MEMORY_H #include <linux/compiler.h> #include <linux/const.h> #include <linux/types.h> #include <mach/memory.h> #include <asm/sizes.h> /* * Allow for constants defined here to be used from assembly code * by prepending the UL suffix only with actual C code compilation. */ #define UL(x) _AC(x, UL) #ifdef CONFIG_MMU /* * PAGE_OFFSET - the virtual address of the start of the kernel image * TASK_SIZE - the maximum size of a user space task. * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area */ #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) /* * The maximum size of a 26-bit user space task. */ #define TASK_SIZE_26 UL(0x04000000) /* * The module space lives between the addresses given by TASK_SIZE * and PAGE_OFFSET - it must be within 32MB of the kernel text. */ #ifndef CONFIG_THUMB2_KERNEL #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) #else /* smaller range for Thumb-2 symbols relocation (2^24)*/ #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024) #endif #if TASK_SIZE > MODULES_VADDR #error Top of user space clashes with start of module space #endif /* * The highmem pkmap virtual space shares the end of the module area. */ #ifdef CONFIG_HIGHMEM #define MODULES_END (PAGE_OFFSET - PMD_SIZE) #else #define MODULES_END (PAGE_OFFSET) #endif /* * The XIP kernel gets mapped at the bottom of the module vm area. * Since we use sections to map it, this macro replaces the physical address * with its virtual address while keeping offset from the base section. */ #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) /* * Allow 16MB-aligned ioremap pages */ #define IOREMAP_MAX_ORDER 24 #define CONSISTENT_END (0xffe00000UL) #else /* CONFIG_MMU */ /* * The limitation of user task size can grow up to the end of free ram region. * It is difficult to define and perhaps will never meet the original meaning * of this define that was meant to. * Fortunately, there is no reference for this in noMMU mode, for now. */ #ifndef TASK_SIZE #define TASK_SIZE (CONFIG_DRAM_SIZE) #endif #ifndef TASK_UNMAPPED_BASE #define TASK_UNMAPPED_BASE UL(0x00000000) #endif #ifndef PHYS_OFFSET #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) #endif #ifndef END_MEM #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) #endif #ifndef PAGE_OFFSET #define PAGE_OFFSET (PHYS_OFFSET) #endif /* * The module can be at any place in ram in nommu mode. */ #define MODULES_END (END_MEM) #define MODULES_VADDR (PHYS_OFFSET) #endif /* !CONFIG_MMU */ /* * We fix the TCM memories max 32 KiB ITCM resp DTCM at these * locations */ #ifdef CONFIG_HAVE_TCM #define ITCM_OFFSET UL(0xfffe0000) #define DTCM_OFFSET UL(0xfffe8000) #endif /* * Convert a physical address to a Page Frame Number and back */ #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) /* * Convert a page to/from a physical address */ #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) #ifndef __ASSEMBLY__ /* * Physical vs virtual RAM address space conversion. These are * private definitions which should NOT be used outside memory.h * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. */ #ifndef __virt_to_phys #ifdef CONFIG_ARM_PATCH_PHYS_VIRT /* * Constants used to force the right instruction encodings and shifts * so that all we need to do is modify the 8-bit constant field. */ #define __PV_BITS_31_24 0x81000000 extern unsigned long __pv_phys_offset; #define PHYS_OFFSET __pv_phys_offset #define __pv_stub(from,to,instr,type) \ __asm__("@ __pv_stub\n" \ "1: " instr " %0, %1, %2\n" \ " .pushsection .pv_table,\"a\"\n" \ " .long 1b\n" \ " .popsection\n" \ : "=r" (to) \ : "r" (from), "I" (type)) static inline unsigned long __virt_to_phys(unsigned long x) { unsigned long t; __pv_stub(x, t, "add", __PV_BITS_31_24); return t; } static inline unsigned long __phys_to_virt(unsigned long x) { unsigned long t; __pv_stub(x, t, "sub", __PV_BITS_31_24); return t; } #else #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) #endif #endif #ifndef PHYS_OFFSET #define PHYS_OFFSET PLAT_PHYS_OFFSET #endif /* * PFNs are used to describe any physical page; this means * PFN 0 == physical address 0. * * This is the PFN of the first RAM page in the kernel * direct-mapped view. We assume this is the first page * of RAM in the mem_map as well. */ #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) /* * These are *only* valid on the kernel direct mapped RAM memory. * Note: Drivers should NOT use these. They are the wrong * translation for translating DMA addresses. Use the driver * DMA support - see dma-mapping.h. */ static inline phys_addr_t virt_to_phys(const volatile void *x) { return __virt_to_phys((unsigned long)(x)); } static inline void *phys_to_virt(phys_addr_t x) { return (void *)(__phys_to_virt((unsigned long)(x))); } /* * Drivers should NOT use these either. */ #define __pa(x) __virt_to_phys((unsigned long)(x)) #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) /* * Virtual <-> DMA view memory address translations * Again, these are *only* valid on the kernel direct mapped RAM * memory. Use of these is *deprecated* (and that doesn't mean * use the __ prefixed forms instead.) See dma-mapping.h. */ #ifndef __virt_to_bus #define __virt_to_bus __virt_to_phys #define __bus_to_virt __phys_to_virt #define __pfn_to_bus(x) __pfn_to_phys(x) #define __bus_to_pfn(x) __phys_to_pfn(x) #endif static inline __deprecated unsigned long virt_to_bus(void *x) { return __virt_to_bus((unsigned long)x); } static inline __deprecated void *bus_to_virt(unsigned long x) { return (void *)__bus_to_virt(x); } /* * Conversion between a struct page and a physical address. * * Note: when converting an unknown physical address to a * struct page, the resulting pointer must be validated * using VALID_PAGE(). It must return an invalid struct page * for any physical address not corresponding to a system * RAM address. * * page_to_pfn(page) convert a struct page * to a PFN number * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * * * virt_to_page(k) convert a _valid_ virtual address to struct page * * virt_addr_valid(k) indicates whether a virtual address is valid */ #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) /* * Optional coherency support. Currently used only by selected * Intel XSC3-based systems. */ #ifndef arch_is_coherent #define arch_is_coherent() 0 #endif #endif #include <asm-generic/memory_model.h> #endif
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